The composition of the smog is complex, including hundreds of chemical particles, mainly based on chemical gases and dust. The dust contains Ag(NO3)2 (nitrate), Na2CO3 K2CO3 (carbonate), C (black carbon). , SIO3 (silicate), Na2SO4 K2SO4 (sulfate), NH4HCO3 (ammonium salt), heavy metals, etc., the metal part contains Fe (iron), Ni (nickel), Pb (lead), Ca (calcium), Na (sodium) )Wait. The organic part is a chemical gas such as nitrogen oxides, organic hydrocarbons, SO2 (sulfur dioxide), NO (nitrogen monoxide), CLO2 (chlorine dioxide), H2S (hydrogen sulfide), various volatile VOCs, and the like.
The toxins in these hazes not only seriously endanger people's health, but also have a great impact on the operation of LED displays . The main influence of smog on LED display has the following two aspects:
1. The influence of fog. The fog is formed by the condensation of water vapor in the air. That is to say, the humidity is relatively large, which will cause the LED display to be wet. Excessive humidity causes the PCB board, power supply, power line and other components of the LED display to be easily oxidized and corroded, or even short-circuited, resulting in malfunction.
2. The impact of cockroaches. Helium is an aggregate of dust, various tiny particles, etc. suspended in the air, and dust particles suspended in the air are the core material of the crucible. Under the long-term influence of cockroaches, all kinds of fine dust in the air will enter the equipment through the vent hole. For the fan and other equipment, the wear and tear will be accelerated, and the dust will fall on the surface of the control device inside the display, which not only reduces the LED display. Heat dissipation and insulation properties also accelerate the aging of the display and affect the normal service life.
In order to prevent the LED display from getting wet in the fog, it is necessary for the owner and the engineer to pay more attention to the purchase and maintenance.
In the procurement process, it is necessary to pay attention to whether the PCB board of the LED display has been treated with anti-corrosion treatment, such as three anti-paint on the surface; whether the power supply and the power cord are selected as high-quality accessories; the screen welding is the most easily corroded place. Whether it has been rust-proof.
During routine maintenance, it is necessary to regularly remove dust to avoid moisture in the air, which will cause short circuit, which will lead to mildew of PCB boards and electronic components. It is worth noting that the long-term use of the surface-mounted LED display will lead to a decrease in reliability. It is recommended to use it for more than one hour per day on a haze day to reduce the erosion of moisture on the display.
IP protection level feature number meaning
In terms of dust prevention, it is necessary to pay attention to whether the purchased LED display reaches the dustproof level required for the use environment. The international standard for dust prevention is IP0X-IP6X, which is a design level to prevent foreign matter from invading. If it is used in northern areas with more dust and haze, it must achieve six levels of dustproof (complete dustproof construction). In areas with a lot of smog weather, the front and back protection levels of the LED display must reach IP65, that is, the LED display adopts a completely dust-proof structure and is sealed in a water spray state.
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